source/libnet/libnet_samsync_keytab.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    dump the remote SAM using rpc samsync operations
   4
   5    Copyright (C) Guenther Deschner 2008.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "libnet/libnet.h"
  23
  24 #if defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC)
  25
  26 /****************************************************************
  27 ****************************************************************/
  28
  29 static NTSTATUS keytab_ad_connect(TALLOC_CTX *mem_ctx,
  30                                   const char *domain_name,
  31                                   const char *username,
  32                                   const char *password,
  33                                   struct libnet_keytab_context *ctx)
  34 {
  35         NTSTATUS status;
  36         ADS_STATUS ad_status;
  37         ADS_STRUCT *ads;
  38         struct netr_DsRGetDCNameInfo *info = NULL;
  39         const char *dc;
  40
  41         status = dsgetdcname(mem_ctx, NULL, domain_name, NULL, NULL, 0, &info);
  42         if (!NT_STATUS_IS_OK(status)) {
  43                 return status;
  44         }
  45
  46         dc = strip_hostname(info->dc_unc);
  47
  48         ads = ads_init(NULL, domain_name, dc);
  49         NT_STATUS_HAVE_NO_MEMORY(ads);
  50
  51         if (getenv(KRB5_ENV_CCNAME) == NULL) {
  52                 setenv(KRB5_ENV_CCNAME, "MEMORY:libnet_samsync_keytab", 1);
  53         }
  54
  55         ads->auth.user_name = SMB_STRDUP(username);
  56         ads->auth.password = SMB_STRDUP(password);
  57
  58         ad_status = ads_connect_user_creds(ads);
  59         if (!ADS_ERR_OK(ad_status)) {
  60                 return NT_STATUS_UNSUCCESSFUL;
  61         }
  62
  63         ctx->ads = ads;
  64
  65         ctx->dns_domain_name = talloc_strdup_upper(mem_ctx, ads->config.realm);
  66         NT_STATUS_HAVE_NO_MEMORY(ctx->dns_domain_name);
  67
  68         return NT_STATUS_OK;
  69 }
  70
  71 /****************************************************************
  72 ****************************************************************/
  73
  74 static NTSTATUS fetch_sam_entry_keytab(TALLOC_CTX *mem_ctx,
  75                                        enum netr_SamDatabaseID database_id,
  76                                        uint32_t rid,
  77                                        struct netr_DELTA_USER *r,
  78                                        struct libnet_keytab_context *ctx)
  79 {
  80         NTSTATUS status;
  81         uint32_t kvno = 0;
  82         DATA_BLOB blob;
  83
  84         if (memcmp(r->ntpassword.hash, ctx->zero_buf, 16) == 0) {
  85                 return NT_STATUS_OK;
  86         }
  87
  88         kvno = ads_get_kvno(ctx->ads, r->account_name.string);
  89         blob = data_blob_const(r->ntpassword.hash, 16);
  90
  91         status = libnet_keytab_add_to_keytab_entries(mem_ctx, ctx,
  92                                                      kvno,
  93                                                      r->account_name.string,
  94                                                      NULL,
  95                                                      ENCTYPE_ARCFOUR_HMAC,
  96                                                      blob);
  97         if (!NT_STATUS_IS_OK(status)) {
  98                 return status;
  99         }
 100
 101         return NT_STATUS_OK;
 102 }
 103
 104 /****************************************************************
 105 ****************************************************************/
 106
 107 static NTSTATUS init_keytab(TALLOC_CTX *mem_ctx,
 108                             struct samsync_context *ctx,
 109                             enum netr_SamDatabaseID database_id,
 110                             uint64_t *sequence_num)
 111 {
 112         krb5_error_code ret = 0;
 113         NTSTATUS status;
 114         struct libnet_keytab_context *keytab_ctx;
 115
 116         ret = libnet_keytab_init(mem_ctx, ctx->output_filename, &keytab_ctx);
 117         if (ret) {
 118                 return krb5_to_nt_status(ret);
 119         }
 120
 121         keytab_ctx->clean_old_entries = ctx->clean_old_entries;
 122         ctx->private_data = keytab_ctx;
 123
 124         status = keytab_ad_connect(mem_ctx,
 125                                    ctx->domain_name,
 126                                    ctx->username,
 127                                    ctx->password,
 128                                    keytab_ctx);
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 TALLOC_FREE(keytab_ctx);
 131                 return status;
 132         }
 133
 134         return status;
 135 }
 136
 137 /****************************************************************
 138 ****************************************************************/
 139
 140 static NTSTATUS fetch_sam_entries_keytab(TALLOC_CTX *mem_ctx,
 141                                          enum netr_SamDatabaseID database_id,
 142                                          struct netr_DELTA_ENUM_ARRAY *r,
 143                                          uint64_t *sequence_num,
 144                                          struct samsync_context *ctx)
 145 {
 146         struct libnet_keytab_context *keytab_ctx =
 147                 (struct libnet_keytab_context *)ctx->private_data;
 148
 149         NTSTATUS status = NT_STATUS_OK;
 150         int i;
 151
 152         for (i = 0; i < r->num_deltas; i++) {
 153
 154                 switch (r->delta_enum[i].delta_type) {
 155                 case NETR_DELTA_USER:
 156                         break;
 157                 case NETR_DELTA_DOMAIN:
 158                         if (sequence_num) {
 159                                 *sequence_num =
 160                                         r->delta_enum[i].delta_union.domain->sequence_num;
 161                         }
 162                         continue;
 163                 case NETR_DELTA_MODIFY_COUNT:
 164                         if (sequence_num) {
 165                                 *sequence_num =
 166                                         *r->delta_enum[i].delta_union.modified_count;
 167                         }
 168                         continue;
 169                 default:
 170                         continue;
 171                 }
 172
 173                 status = fetch_sam_entry_keytab(mem_ctx, database_id,
 174                                                 r->delta_enum[i].delta_id_union.rid,
 175                                                 r->delta_enum[i].delta_union.user,
 176                                                 keytab_ctx);
 177                 if (!NT_STATUS_IS_OK(status)) {
 178                         goto out;
 179                 }
 180         }
 181  out:
 182         return status;
 183 }
 184
 185 /****************************************************************
 186 ****************************************************************/
 187
 188 static NTSTATUS close_keytab(TALLOC_CTX *mem_ctx,
 189                              struct samsync_context *ctx,
 190                              enum netr_SamDatabaseID database_id,
 191                              uint64_t sequence_num)
 192 {
 193         struct libnet_keytab_context *keytab_ctx =
 194                 (struct libnet_keytab_context *)ctx->private_data;
 195         krb5_error_code ret;
 196         NTSTATUS status;
 197
 198         ret = libnet_keytab_add(keytab_ctx);
 199         if (ret) {
 200                 status = krb5_to_nt_status(ret);
 201                 ctx->error_message = talloc_asprintf(ctx,
 202                         "Failed to add entries to keytab %s: %s",
 203                         keytab_ctx->keytab_name, error_message(ret));
 204                 TALLOC_FREE(keytab_ctx);
 205                 return status;
 206         }
 207
 208         ctx->result_message = talloc_asprintf(ctx,
 209                 "Vampired %d accounts to keytab %s",
 210                 keytab_ctx->count,
 211                 keytab_ctx->keytab_name);
 212
 213         TALLOC_FREE(keytab_ctx);
 214
 215         return NT_STATUS_OK;
 216 }
 217
 218 #else
 219
 220 static NTSTATUS init_keytab(TALLOC_CTX *mem_ctx,
 221                             struct samsync_context *ctx,
 222                             enum netr_SamDatabaseID database_id,
 223                             uint64_t *sequence_num)
 224 {
 225         return NT_STATUS_NOT_SUPPORTED;
 226 }
 227
 228 static NTSTATUS fetch_sam_entries_keytab(TALLOC_CTX *mem_ctx,
 229                                          enum netr_SamDatabaseID database_id,
 230                                          struct netr_DELTA_ENUM_ARRAY *r,
 231                                          uint64_t *sequence_num,
 232                                          struct samsync_context *ctx)
 233 {
 234         return NT_STATUS_NOT_SUPPORTED;
 235 }
 236
 237 static NTSTATUS close_keytab(TALLOC_CTX *mem_ctx,
 238                              struct samsync_context *ctx,
 239                              enum netr_SamDatabaseID database_id,
 240                              uint64_t sequence_num)
 241 {
 242         return NT_STATUS_NOT_SUPPORTED;
 243 }
 244
 245 #endif /* defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC) */
 246
 247 const struct samsync_ops libnet_samsync_keytab_ops = {
 248         .startup                = init_keytab,
 249         .process_objects        = fetch_sam_entries_keytab,
 250         .finish                 = close_keytab
 251 };